// 普通函子
class Container {
	static of(value) {
		return new Container(value)
	}

	constructor(value) {
		this._value = value
	}

	map(fn) {
		return Container.of(fn(this._value))
	}

}

// Maybe函子
class Maybe {
	static of(value) {
		return new Maybe(value)
	}

	constructor (value) {
		this._value = value
	}

	map(fn) {
		return this.isNothing() ? this : Maybe.of(fn(this._value))
	}

	isNothing() {
		return this._value === null || this._value === undefined
	}

}


module.exports = {
	Container,
	Maybe
}